Fix DCHECK caused by specifying a negative timestamp offset.

content/renderer/media/websourcebuffer_impl.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/media/websourcebuffer_impl.h"
 
+#include <limits>
+
 #include "base/float_util.h"
 #include "media/filters/chunk_demuxer.h"
 
 namespace content {
 
 static base::TimeDelta DoubleToTimeDelta(double time) {
   DCHECK(!base::IsNaN(time));
-  DCHECK_GE(time, 0);
+  DCHECK_NE(time, -std::numeric_limits<double>::infinity());
+
   if (time == std::numeric_limits<double>::infinity())
     return media::kInfiniteDuration();
 
   // Don't use base::TimeDelta::Max() here, as we want the largest finite time
   // delta.
   base::TimeDelta max_time = base::TimeDelta::FromInternalValue(kint64max - 1);
   double max_time_in_seconds = max_time.InSecondsF();
 
   if (time >= max_time_in_seconds)
     return max_time;
@@ skipping 57 matching lines @@
   // more than microsecond precision.
   if (timestamp_offset && old_offset != timestamp_offset_)
     *timestamp_offset = timestamp_offset_.InSecondsF();
 }
 
 void WebSourceBufferImpl::abort() {
   demuxer_->Abort(id_);
 }
 
 void WebSourceBufferImpl::remove(double start, double end) {
+  DCHECK_GE(start, 0);
+  DCHECK_GE(end, 0);
   demuxer_->Remove(id_, DoubleToTimeDelta(start), DoubleToTimeDelta(end));
 }
 
 bool WebSourceBufferImpl::setTimestampOffset(double offset) {
   if (demuxer_->IsParsingMediaSegment(id_))
     return false;
 
   timestamp_offset_ = DoubleToTimeDelta(offset);
   return true;
 }
 
 void WebSourceBufferImpl::setAppendWindowStart(double start) {
+  DCHECK_GE(start, 0);
   append_window_start_ = DoubleToTimeDelta(start);
 }
 
 void WebSourceBufferImpl::setAppendWindowEnd(double end) {
+  DCHECK_GE(end, 0);
   append_window_end_ = DoubleToTimeDelta(end);
 }
 
 void WebSourceBufferImpl::removedFromMediaSource() {
   demuxer_->RemoveId(id_);
   demuxer_ = NULL;
 }
 
 }  // namespace content